The "Game of Thrones" alum, 23, looked striking in a gown fit for a Bond girl in an Instagram post she shared Saturday. The black Alexandre Vauthier Couture dress features a thigh-high slit and plunging neckline with an attached gold metal collar. Look familiar? Joe's one-time girlfriend Taylor Swift wore the same gown to Vanity Fair's 2016 Oscars after-party.

Jonas channeled his inner Bond in a white tux with a black bow tie and black slacks. Per the couple's social media posts, guests received "Joe Jonas 30" baseball hats designed to look like the famous 007 logo.

The party, which took place over the weekend in New York, came as a break for the Jonas Brothers, who kicked off their Happiness Begins tour Aug. 7 in Miami. They performed Thursday night in Washington and Saturday night in Boston.

Turner celebrated Joe's actual birthday Thursday on Instagram, where she wished a "happy 30th to my love and the best thing that's ever happened to me" in a since-expired Instagram Story.

Kevin Jonas also wished his younger brother a happy birthday: "You are the man we love you so much now let's play a show and party!!!!!"

Nick Jonas shared a photo of the two of them, calling Joe his "best friend."

Jonas and Turner officially married May 1 in a low-key, Elvis impersonator-officiated Las Vegas ceremony after the Billboard Music Awards. They threw another ceremony two months later in France – one that was significantly more upscale and brought family, friends and other recognizable stars to celebrate together.

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To be young and in love... That's what it's like for these celebrity couples under 23 -- like Kylie Jenner, 20, and boyfriend Travis Scott, who attended the Met Gala together on May 7, 2018 in New York. Dia Dipasupil

The couple have kept their relationship fairly private, aside from their engagement announcement and a few red carpet events, including the Met Gala on on May 1, 2017 in New York, seen here. Daniel Zuchnik, Getty Images